i'll fix these ones later

src/js/node/net.ts

@@ -27,7 +27,7 @@ const { ExceptionWithHostPort } = require("internal/shared");
 import type { SocketListener } from "bun";
 import type { ServerOpts, Server as ServerType } from "node:net";
 const { getTimerDuration } = require("internal/timers");
-const { validateFunction, validateNumber } = require("internal/validators");
+const { validateFunction, validateNumber, validateUint32 } = require("internal/validators");
 
 // IPv4 Segment
 const v4Seg = "(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9])";
@@ -494,6 +494,7 @@ const Socket = (function (InternalSocket) {
     _parent;
     _parentWrap;
     #socket;
+    #fd: number | null = null;
     server;
     pauseOnConnect = false;
     #upgraded;
@@ -514,6 +515,7 @@ const Socket = (function (InternalSocket) {
         noDelay = false,
         keepAlive = false,
         keepAliveInitialDelay = 0,
+        fd,
         ...opts
       } = options || {};
 
@@ -532,6 +534,10 @@ const Socket = (function (InternalSocket) {
       this._parentWrap = this;
       this.#pendingRead = undefined;
       this.#upgraded = null;
+      if (fd != null) {
+        validateUint32(fd, "options.fd");
+        this.#fd = fd;
+      }
 
       this[kSetNoDelay] = Boolean(noDelay);
       this[kSetKeepAlive] = Boolean(keepAlive);
@@ -917,7 +923,7 @@ const Socket = (function (InternalSocket) {
         this._writableState.destroyed = true;
       }
 
-      detachSocket(self);
+      this._handle = null;
       callback(err);
       process.nextTick(emitCloseNT, this, !!err);
     }
@@ -1015,6 +1021,7 @@ const Socket = (function (InternalSocket) {
       } else {
         this.destroy($ERR_SOCKET_CLOSED_BEFORE_CONNECTION("ERR_SOCKET_CLOSED_BEFORE_CONNECTION"));
       }
+      return this;
     }
 
     setKeepAlive(enable = false, initialDelayMsecs = 0) {

test/js/node/test/parallel/test-net-socket-constructor.js

@@ -0,0 +1,65 @@
+'use strict';
+
+const common = require('../common');
+const assert = require('assert');
+const cluster = require('cluster');
+const net = require('net');
+
+assert.throws(() => {
+  new net.Socket({ fd: -1 });
+}, { code: 'ERR_OUT_OF_RANGE' });
+
+assert.throws(() => {
+  new net.Socket({ fd: 'foo' });
+}, { code: 'ERR_INVALID_ARG_TYPE' });
+
+function test(sock, readable, writable) {
+  let socket;
+  if (sock instanceof net.Socket) {
+    socket = sock;
+  } else {
+    socket = new net.Socket(sock);
+    socket.unref();
+  }
+
+  assert.strictEqual(socket.readable, readable);
+  assert.strictEqual(socket.writable, writable);
+}
+
+if (cluster.isPrimary) {
+  test(undefined, true, true);
+
+  const server = net.createServer(common.mustCall((socket) => {
+    socket.unref();
+    test(socket, true, true);
+    test({ handle: socket._handle }, true, true);
+    test({ handle: socket._handle, readable: true, writable: true },
+         true, true);
+    server.close();
+  }));
+
+  server.listen(common.mustCall(() => {
+    const { port } = server.address();
+    const socket = net.connect(port, common.mustCall(() => {
+      test(socket, true, true);
+      socket.end();
+    }));
+
+    test(socket, true, true);
+  }));
+
+  cluster.setupPrimary({
+    stdio: ['pipe', 'pipe', 'pipe', 'ipc', 'pipe', 'pipe', 'pipe']
+  });
+
+  const worker = cluster.fork();
+  worker.on('exit', common.mustCall((code, signal) => {
+    assert.strictEqual(code, 0);
+    assert.strictEqual(signal, null);
+  }));
+} else {
+  test(4, true, true);
+  test({ fd: 5 }, true, true);
+  test({ fd: 6, readable: true, writable: true }, true, true);
+  process.disconnect();
+}